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app_vue/node_modules/node-forge/lib/baseN.js

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+/**
+ * Base-N/Base-X encoding/decoding functions.
+ *
+ * Original implementation from base-x:
+ * https://github.com/cryptocoinjs/base-x
+ *
+ * Which is MIT licensed:
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright base-x contributors (c) 2016
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+var api = {};
+module.exports = api;
+
+// baseN alphabet indexes
+var _reverseAlphabets = {};
+
+/**
+ * BaseN-encodes a Uint8Array using the given alphabet.
+ *
+ * @param input the Uint8Array to encode.
+ * @param maxline the maximum number of encoded characters per line to use,
+ *          defaults to none.
+ *
+ * @return the baseN-encoded output string.
+ */
+api.encode = function(input, alphabet, maxline) {
+  if(typeof alphabet !== 'string') {
+    throw new TypeError('"alphabet" must be a string.');
+  }
+  if(maxline !== undefined && typeof maxline !== 'number') {
+    throw new TypeError('"maxline" must be a number.');
+  }
+
+  var output = '';
+
+  if(!(input instanceof Uint8Array)) {
+    // assume forge byte buffer
+    output = _encodeWithByteBuffer(input, alphabet);
+  } else {
+    var i = 0;
+    var base = alphabet.length;
+    var first = alphabet.charAt(0);
+    var digits = [0];
+    for(i = 0; i < input.length; ++i) {
+      for(var j = 0, carry = input[i]; j < digits.length; ++j) {
+        carry += digits[j] << 8;
+        digits[j] = carry % base;
+        carry = (carry / base) | 0;
+      }
+
+      while(carry > 0) {
+        digits.push(carry % base);
+        carry = (carry / base) | 0;
+      }
+    }
+
+    // deal with leading zeros
+    for(i = 0; input[i] === 0 && i < input.length - 1; ++i) {
+      output += first;
+    }
+    // convert digits to a string
+    for(i = digits.length - 1; i >= 0; --i) {
+      output += alphabet[digits[i]];
+    }
+  }
+
+  if(maxline) {
+    var regex = new RegExp('.{1,' + maxline + '}', 'g');
+    output = output.match(regex).join('\r\n');
+  }
+
+  return output;
+};
+
+/**
+ * Decodes a baseN-encoded (using the given alphabet) string to a
+ * Uint8Array.
+ *
+ * @param input the baseN-encoded input string.
+ *
+ * @return the Uint8Array.
+ */
+api.decode = function(input, alphabet) {
+  if(typeof input !== 'string') {
+    throw new TypeError('"input" must be a string.');
+  }
+  if(typeof alphabet !== 'string') {
+    throw new TypeError('"alphabet" must be a string.');
+  }
+
+  var table = _reverseAlphabets[alphabet];
+  if(!table) {
+    // compute reverse alphabet
+    table = _reverseAlphabets[alphabet] = [];
+    for(var i = 0; i < alphabet.length; ++i) {
+      table[alphabet.charCodeAt(i)] = i;
+    }
+  }
+
+  // remove whitespace characters
+  input = input.replace(/\s/g, '');
+
+  var base = alphabet.length;
+  var first = alphabet.charAt(0);
+  var bytes = [0];
+  for(var i = 0; i < input.length; i++) {
+    var value = table[input.charCodeAt(i)];
+    if(value === undefined) {
+      return;
+    }
+
+    for(var j = 0, carry = value; j < bytes.length; ++j) {
+      carry += bytes[j] * base;
+      bytes[j] = carry & 0xff;
+      carry >>= 8;
+    }
+
+    while(carry > 0) {
+      bytes.push(carry & 0xff);
+      carry >>= 8;
+    }
+  }
+
+  // deal with leading zeros
+  for(var k = 0; input[k] === first && k < input.length - 1; ++k) {
+    bytes.push(0);
+  }
+
+  if(typeof Buffer !== 'undefined') {
+    return Buffer.from(bytes.reverse());
+  }
+
+  return new Uint8Array(bytes.reverse());
+};
+
+function _encodeWithByteBuffer(input, alphabet) {
+  var i = 0;
+  var base = alphabet.length;
+  var first = alphabet.charAt(0);
+  var digits = [0];
+  for(i = 0; i < input.length(); ++i) {
+    for(var j = 0, carry = input.at(i); j < digits.length; ++j) {
+      carry += digits[j] << 8;
+      digits[j] = carry % base;
+      carry = (carry / base) | 0;
+    }
+
+    while(carry > 0) {
+      digits.push(carry % base);
+      carry = (carry / base) | 0;
+    }
+  }
+
+  var output = '';
+
+  // deal with leading zeros
+  for(i = 0; input.at(i) === 0 && i < input.length() - 1; ++i) {
+    output += first;
+  }
+  // convert digits to a string
+  for(i = digits.length - 1; i >= 0; --i) {
+    output += alphabet[digits[i]];
+  }
+
+  return output;
+}